This is a plant I found growing in my 10 gallon tank. It was tangled in one of my plastic plants right under where the water flows out of the filter. What do you think it is? The only other plants in that tank are an anubias nana a couple of java ferns and of course some algae but not much.

I think it looks like java moss cause it doesn't have any roots. It wasnt growing anywhere near the ground actually.

Heres a grown mystery snail for comparison...
(that snail doesn't live in there I just put him in there for awhile b/c he had a little mishap having to do with the filter, long story)